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Notes Payable and Other Noncurrent Liabilities - Current and Noncurrent Portions of Notes Payable (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 22, 2019
Sep. 30, 2019
Dec. 31, 2018
Notes Payable and Other Noncurrent Liabilities      
Less: Current portion   $ 45,332 $ 36,468
Notes payable, less current portion   211,060 23,437
Amended and restated credit agreement      
Notes Payable and Other Noncurrent Liabilities      
Notes payable including current portion   256,392 59,905
Less: Current portion   45,332 36,468
Notes payable, less current portion   211,060 23,437
Amended and restated credit agreement | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on interest rate 2.00%    
Amended and restated credit agreement | Term loan facility      
Notes Payable and Other Noncurrent Liabilities      
Quarterly payment of notes payable   8,368  
Notes payable including current portion   $ 161,392 $ 59,905
Amended and restated credit agreement | Term loan facility | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on interest rate   2.00%  
Interest rate of notes payable   4.10%  
Amended and restated credit agreement | Revolving credit facility      
Notes Payable and Other Noncurrent Liabilities      
Notes payable including current portion   $ 95,000  
Amended and restated credit agreement | Revolving credit facility | 30-Day LIBOR      
Notes Payable and Other Noncurrent Liabilities      
Margin on interest rate   2.00%  
Interest rate of notes payable   4.10%